Sounds like your TCC (Torque Convertor Clutch) solenoid is sticking.
Your transmission locks in the convertor above 45 mph to increase fuel mileage. When the solenoid stick on, the covertor wont unlock and when you come to a stop its like coming to a stop with a manual trans and not pushing in the clutch.
Try this, on the front of the trans right behind the bell housing about half way up on the case will be a four wire connector. Un plug it and try driving your car again. If the solenoid is bad this will keep it from engaging.
Maybe this will help, maybe not. For the price, its worth a try.
